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authorJoerg Roedel <joerg.roedel@amd.com>2008-02-07 13:47:40 +0100
committerAvi Kivity <avi@qumranet.com>2008-04-27 11:53:19 +0300
commit6c7dac72d5c7dc0e09512dce865398167be9a8f7 (patch)
tree2c10ebc4871ce0a688f139dbb4c6e81a45cc4286
parente3da3acdb32c1804a5c853feebcc037b7434076f (diff)
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KVM: SVM: add module parameter to disable Nested Paging
To disable the use of the Nested Paging feature even if it is available in hardware this patch adds a module parameter. Nested Paging can be disabled by passing npt=0 to the kvm_amd module. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
-rw-r--r--arch/x86/kvm/svm.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index c12a759..fb5d6c2 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -48,6 +48,9 @@ MODULE_LICENSE("GPL");
#define SVM_DEATURE_SVML (1 << 2)
static bool npt_enabled = false;
+static int npt = 1;
+
+module_param(npt, int, S_IRUGO);
static void kvm_reput_irq(struct vcpu_svm *svm);
@@ -418,6 +421,11 @@ static __init int svm_hardware_setup(void)
if (!svm_has(SVM_FEATURE_NPT))
npt_enabled = false;
+ if (npt_enabled && !npt) {
+ printk(KERN_INFO "kvm: Nested Paging disabled\n");
+ npt_enabled = false;
+ }
+
if (npt_enabled)
printk(KERN_INFO "kvm: Nested Paging enabled\n");